CN103490821A - Light single side band polarization modulation method and device - Google Patents

Light single side band polarization modulation method and device Download PDF

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Publication number
CN103490821A
CN103490821A CN201310419534.3A CN201310419534A CN103490821A CN 103490821 A CN103490821 A CN 103490821A CN 201310419534 A CN201310419534 A CN 201310419534A CN 103490821 A CN103490821 A CN 103490821A
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polarization
light
modulation
microwave
modulator
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CN103490821B (en
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潘时龙
张亚梅
张方正
顾晓文
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a light single side band polarization modulation method. Microwave signals output by a microwave source are divided into two paths of orthogonal microwave signals, one path of microwave signals are modulated on linear polarization light carrier wave in a polarization module method to generate initial polarization modulation signals, the polarization state of the initial polarization modulation signals are rotated at 45 degrees, and the other path of microwave signals are modulated on the initial polarization modulation signals with the polarization modulation direction rotated in a polarization modulation method to obtain the final light single side band polarization modulation signals. The invention further discloses a light single side band polarization modulation device using the modulation method. The light single side band polarization modulation device comprises a linear polarization light source, a first polarization modulator, a polarization controller, a second polarization modulator, the microwave source and a microwave electric bridge which are sequentially connected in the light path direction. The light single side band polarization modulation method can simultaneously achieve light single side band modulation with complementary phase modulation on two orthogonal polarization states and has the advantages of uncorrelated to wavelength, large in bandwidth, tunable in frequency and the like.

Description

A kind of optical SSB Polarization Modulation method and device
Technical field
The present invention relates to a kind of optical SSB modulation method, relate in particular to a kind of optical SSB Polarization Modulation method and device, belong to photoelectricity modulation, Microwave photonics technical field.
Background technology
Optical SSB (Optical Single Sideband, OSSB) modulation is as a kind of important electrooptic modulation technology, in fields such as light carrier radio communication (Radio over Fiber, ROF), the measurement of high accuracy photonic device, wavelength conversion, the processing of microwave photon signal, play an important role.Typical optical SSB modulation has the optical SSB intensity modulated, utilize a single order sideband in light notch filter filtering light double-sideband intensity-modulated signal to obtain the optical SSB intensity-modulated signal, also can utilize an optical SSB intensity modulator to obtain the optical SSB intensity-modulated signal.Common light notch filter mainly contains Fiber Bragg Grating FBG, array waveguide grating and the filter based on the stimulated Brillouin scattering realization etc.; Common optical single sideband modulator has two MZ Mach-Zehnders and pair parallel MZ Mach-Zehnders etc. of driving.Yet the optical SSB intensity-modulated signal only utilizes the amplitude carry information of light signal, other dimensions of light are idle, for the society of information expansion nowadays, need the utilance of further expansion spectrum badly, improve application and the applying flexible degree of optical SSB, thereby another typical optical SSB modulation mode---the optical SSB Polarization Modulation is suggested.The optical SSB Polarization Modulation has all characteristics that the optical SSB intensity modulated has, and special is that the optical SSB Polarization Modulation has realized optical SSB modulation on two vertical polarization states of light simultaneously, and two polarization states have complementary Phase Modulation Properties.The optical SSB Polarization Modulation produces at code signal, and ultra-broadband signal produces and microwave photon signal processing aspect has application.Realize that at present the method for optical SSB Polarization Modulation only has filter method, utilize a single order sideband of a light double-sideband polarization modulation signals of an optical filter filtering to realize, this light double-sideband polarization modulation signals drives a light polarization modulator to obtain by a signal of telecommunication.The shortcoming of this kind of method is fairly obvious, if use the light notch filter of large bandwidth, can have influence on the amplitude of sideband on every side, if use little bandwidth filter to exist, suppresses the lower problem of the degree of depth; Optical filter is difficult to accomplish that slope is very precipitous simultaneously, thereby is difficult to realize the single-side belt filtering of small frequency modulation signal in the impregnable situation of other sidebands, thus the lower limit of restriction system bandwidth of operation; In addition, this kind of method has selectivity to wavelength, makes the tunable performance of system poor, and light source exists the problem of wave length shift usually, if now system has selectivity to wavelength, can affect the stability of entire system.
Summary of the invention
It is relevant that technical problem to be solved by this invention is to overcome the existing existing wavelength of optical SSB polarization Modulation, the problems such as the precipitous not Bandwidth-Constrained caused of filter passband slope and tunability are poor, a kind of optical SSB Polarization Modulation method and device are provided, not only can on the pairwise orthogonal polarization state, realize having the optical SSB modulation of complementary phases modulation simultaneously, and it is uncorrelated to have a wavelength, be with the advantages such as roomy, frequency-tunable.
Optical SSB Polarization Modulation method of the present invention, be divided into the microwave signal of two-way quadrature by the microwave signal of microwave source output, and the mode of utilizing Polarization Modulation wherein a road microwave signal be modulated on the linearly polarized light carrier wave, generate initial polarization modulation signals; By after 45 ° of the polarization state of initial polarization modulation signals rotations, utilize the mode of Polarization Modulation that an other road microwave signal is modulated on the postrotational initial polarization modulation signals in polarization direction, obtain final optical SSB polarization modulation signals.
Optical SSB Polarization Modulation device of the present invention comprises linear polarization light source, the first light polarization modulator, Polarization Controller, the second light polarization modulator connected successively along optical path direction, and microwave source, 90 is spent microwave bridges; The output of microwave source is connected with the input of 90 degree microwave bridges, and two outputs of 90 degree microwave bridges are connected with the driving signal input of the first light polarization modulator and the driving signal input of the second light polarization modulator respectively; Output after described Polarization Controller can rotate 45 ° by input polarisation of light state.
Preferably, described the first light polarization modulator has identical Polarization Modulation coefficient with the second light polarization modulator.
Further, described optical SSB Polarization Modulation device also comprises the identical signal amplitude adjusting device of driving signal amplitude that can make the first light polarization modulator, the second light polarization modulator.
The described 90 preferred broadband of degree microwave bridge 90 degree microwave bridges, described the first light polarization modulator, the preferred wideband polarization modulator of the second light polarization modulator, the preferred wide-band microwave Sweep Source of described microwave source, thus can in large bandwidth range, realize the optical SSB Polarization Modulation.
Compared to existing technology, the present invention has following following beneficial effect:
The present invention, to the optical carrier wavelength non-selectivity, can realize broadband single-side belt frequency sweep fast, has also broken through the limitation of traditional intensity optical SSB intensity modulated, has realized having the optical SSB modulation of complementary phases modulation on the pairwise orthogonal polarization state simultaneously; Utilize this characteristic can realize the incoherent 360 degree micro-wave light quantum phase shifters of power, in microwave photon signal process field, there is extremely important effect;
The present invention is insensitive to dispersion, can significantly improve the transmission performance of long distance.
The accompanying drawing explanation
The structural principle schematic diagram that Fig. 1 is optical SSB Polarization Modulation device of the present invention;
The spectrogram of the optical SSB polarization modulation signals that Fig. 2 (a) obtains for emulation; The spectrogram of the optical SSB polarization modulation signals that Fig. 2 (b) obtains for apparatus of the present invention;
The optical SSB polarization modulation signals that Fig. 3 is apparatus of the present invention realization is corresponding to the tuned light spectrogram of different driving signal frequency;
Fig. 4 (a) surveys for light polarization modulator 2 output signals directly enter PD the spectrogram obtained; Fig. 4 (b) surveys for light polarization modulator 2 output signals enter PD after an analyzer spectrogram obtained; Fig. 4 (c) and Fig. 4 (d) are respectively and control 360 phase shifters of spending that the analyzer angle realizes, Fig. 4 (c) is 2GHz, and Fig. 4 (d) is 35GHz;
Fig. 5 (a) and Fig. 5 (b) are respectively spectrogram and the planisphere that the direct input spectrum instrument of 10GHz50M baud 16 quadrature amplitude modulation (QAM) signal that microwave source produces records; Fig. 5 (c) and Fig. 5 (d) are respectively the modulation of optical SSB polarization modulation signals spectrogram and the planisphere that above 50M baud 16QAM signal records after the 25km Optical Fiber Transmission that apparatus of the present invention produce.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is elaborated:
Optical SSB Polarization Modulation device of the present invention as shown in Figure 1, comprising: linear polarization light source, light polarization modulator 1, Polarization Controller, light polarization modulator 2, microwave source, 90 degree microwave bridges.As shown in the figure, the output of linear polarization light source is connected with the light input end of light polarization modulator 1; The input of Polarization Controller, output are connected with the light output end of light polarization modulator 1, the light input end of light polarization modulator 2 respectively; The output of microwave source is connected with the input of 90 degree microwave bridges, and two outputs of 90 degree microwave bridges are connected with the driving signal input of light polarization modulator 1, light polarization modulator 2 respectively.Wherein linear polarization light source and microwave source are respectively used to produce required optical carrier and microwave signal; 90 degree microwave bridges divide for the microwave signal by microwave source output the two paths of signals be orthogonal; Two light polarization modulators are for realizing the photoelectricity Polarization Modulation.
As shown in Figure 1, the microwave signal of microwave source output is divided into the microwave signal of two-way quadrature by 90 degree microwave bridges: homophase (0 °) microwave signal and quadrature (90 °) microwave signal; This two way microwave signals is respectively as driving signal input polarization modulator 1, light polarization modulator 2; Light polarization modulator 1 is modulated to the homophase microwave signal on the linearly polarized light carrier wave of linear polarization light source output, and the polarization modulation signals of output can be referred to as initial polarization modulation signals; Polarization Controller, by after 45 ° of the polarization state of initial polarization modulation signals rotations, exports it to light polarization modulator 2; Light polarization modulator 2 is modulated to the quadrature microwave signal on the postrotational initial polarization modulation signals of polarization state, and output realize to suppress the optical SSB modulation signal with complementary phases modulation of-1 rank sideband (or+1 rank sideband) on the polarization state of pairwise orthogonal simultaneously.
In technical solution of the present invention, the 90 preferred broadband of degree microwave bridge 90 degree microwave bridges.Light polarization modulator 1, light polarization modulator 2 can adopt existing various light polarization modulator, and for example the light polarization modulator based on GeAs and the light polarization modulator based on liquid crystal, preferably adopt the wideband polarization modulator based on GeAs.The preferred wide-band microwave Sweep Source of described microwave source, thus can in large bandwidth range, realize the optical SSB Polarization Modulation.
In technical solution of the present invention, the index of modulation of light polarization modulator 1, light polarization modulator 2 is identical (can certainly be different) preferably.For the modulation depth that makes two light polarization modulators identical, thereby further improve performance, optical SSB Polarization Modulation device of the present invention can also comprise the identical signal amplitude adjusting device of driving signal amplitude that can make light polarization modulator 1, light polarization modulator 2, for example, can be adjusted than great mono-tunnel microwave signal amplitude by attenuator, or by amplifier, amplitude be adjusted than little mono-tunnel microwave signal.
More clearly understand technical solution of the present invention for the ease of the public, below theoretical principle of the present invention is briefly introduced to the optical SSB modulation of rank, inhibition+1 sideband (take be example).
If the two way microwave signals of 90 degree microwave bridge outputs is respectively E 1=Vcos (ω mt) and optical carrier is E o=exp (j ω t), first light polarization modulator is by E 1drive, the signal of first light polarization modulator output is:
E PolM 1 = E polm 1 x E polm 1 y = J 1 ( γ ) expj ( ωt - ω m t + π 2 ) J 0 ( γ ) exp ( jωt ) J 1 ( γ ) expj ( ωt + ω m t + π 2 ) J 1 ( γ ) expj ( ωt - ω m t ) J 0 ( γ ) exp ( jωt + π 2 ) J 1 ( γ ) expj ( ωt + ω m t )
Above formula is to dispense the Bezier expansion that is greater than 1 rank sideband, E polm1ywith respect to E polm1xintroduced the phase shift of 90 degree.Wherein, J m(γ) (m=± 1,0) represents the coefficient of Bessel function m rank expansion when the index of modulation is γ, and J -m(γ)=-J m(γ), (m is odd number, thereby only has J in above-mentioned formula 1(γ)), γ=π V/V wherein π, V πhalf-wave voltage for light polarization modulator.
Be injected into second light polarization modulator control polarization state rotation 45 degree of above-mentioned light signal by Polarization Controller after, the signal entered before second light polarization modulator is:
E PC = J 1 ( γ ) expj ( ωt - ω m t + π 4 ) J 0 ( γ ) expj ( ωt + π 4 ) J 1 ( γ ) expj ( ωt + ω m t + π 4 ) J 1 ( γ ) expj ( ωt - ω m t - π 4 ) J 0 ( γ ) expj ( ωt + 3 π 4 ) J 1 ( γ ) expj ( ωt + ω m t - π 4 )
Above-mentioned light double-sideband modulation signal experiences Polarization Modulation for the second time in second light polarization modulator, and the signal at second light polarization modulator output is:
E PolM 2 = 2 J 1 ( γ ) J 0 ( γ ) expj ( ωt - ω m t + π 4 ) J 0 2 ( γ ) expj ( ωt + π 4 ) 2 J 1 ( γ ) J 0 ( γ ) expj ( ωt - ω m t - π 4 ) J 0 2 ( γ ) expj ( ωt + 3 π 4 )
Now, the amplitude of+1 rank sideband is zero, and the amplitude of light carrier and-1 rank sideband is all non-vanishing, thereby has realized optical SSB modulation, and has complementary phase-modulation on the polarization state of pairwise orthogonal.Therefore, adopt modulating device of the present invention to produce the optical SSB polarization modulation signals of curb+1 rank sideband, and there is complementary phase-modulation on the pairwise orthogonal polarization state.
The spectrogram of the optical SSB polarization modulation signals that Fig. 2 (a) obtains for emulation.Due to the simulated conditions ideal, the index of modulation of twice Polarization Modulation is strictly identical, and the microwave-driven signal strict orthogonal of using, thereby+1 rank sideband obtained great inhibition.Fig. 2 (b) realizes the spectrogram of optical SSB Polarization Modulation front and back for apparatus of the present invention, the spectrum of the light double-sideband polarization modulation signals that in figure, the represented curve of dotted line is light polarization modulator 1 output, the spectrum of the optical SSB polarization modulation signals that the represented curve of solid line is light polarization modulator 2 outputs.As can be seen from the figure, suppress sideband is comparatively desirable, and the suppress sideband ratio is greater than 30dB, and with the gap of simulation result, to be mainly that modulation depth due to two light polarization modulators can not reach desirable consistent.
In order to verify that the single-side belt that the present invention obtains can regulate on a large scale, we change to 35GHz by the frequency of radiofrequency signal from 5GHz, observe the spectrogram of its output with spectrometer after second light polarization modulator, as shown in Figure 3.As can be seen from the figure, each Frequency point has all been realized optical SSB modulation.For the signal than small frequency (being less than 5GHz), for example for the signal of 2GHz because laser linewidth is wider, make the single-side belt of realization not obvious.The 360 degree adjustable phase shifters of the 2GHz that Fig. 4 (c) realizes from behind can be reached a conclusion, i.e. the present invention still can realize optical SSB modulation for the signal of 2GHz.Sideband for the 35GHz curve in figure is less, and this phenomenon is mainly caused by microwave source output signal power unevenness, and microwave source only has general 3dBm in the merit maximum of 35GHz place output, and is 10dBm for the power of other frequency component outputs.And also there is the decay of 3dB left and right in the 90 degree microwave bridges that use at high frequency 35GHz place, thereby have caused 35GHz place sideband less.Yet nonetheless, still can realize optical SSB modulation.Fig. 4 has illustrated that optical SSB Polarization Modulation device of the present invention has the frequency-tunable ability, and suppress sideband is effective, all is greater than 20dB.As seen from the above analysis, optical SSB Polarization Modulation device of the present invention can be realized the single-side band modulation of maximal strip wide region, and bandwidth mainly is limited to the bandwidth of 90 used degree microwave bridges.
For the signal that to verify the gained signal be the optical SSB Polarization Modulation, there is complementary phase-modulation in two polarization states, the signal of gained is directly input into photodetector and is surveyed, on the polarization state of pairwise orthogonal, respectively obtain a radiofrequency signal, and there is complementary phase relation in these two radiofrequency signals, offset so relevant, export without radio frequency.And if analyzer of cascade is selected the signal of different polarization states, the input photodetector can obtain radiofrequency signal.Fig. 4 (a) surveys for light polarization modulator 2 output signals directly enter PD the spectrogram obtained, and there is no radiofrequency signal in figure; Fig. 4 (b) surveys for light polarization modulator 2 output signals enter PD after an analyzer spectrogram obtained, as can be seen from the figure at the 15GHz place, there is a radiofrequency signal to produce, experimental result and analysis result coincide, thereby confirm the existence of optical SSB Polarization Modulation.
In order further to verify the signal of this single-side belt Polarization Modulation, analyzer of the optical SSB signal cascade that second light polarization modulator exported.Between two polarization states of the optical SSB signal by setting the second light polarization modulator output, phase difference is ± 90 degree, the analyzing angle when analyzer is α, and the analyzer output end signal is E pol=cos α E x+ sin α E y=cos α E x± jsin α E x=E xexp (± j α).Thereby the signal amplitude of exporting after analyzing do not change, the phase shift of only introduced ± α.Signal after photodetector is surveyed has the phase shift of 2 α.Fig. 4 (c) and Fig. 4 (d) are the phase response curve of the micro-wave light quantum phase shifter that utilizes above-mentioned analysis to realize, wherein Fig. 4 (c) is the phase response of a 2GHz driving signal of modulation, and Fig. 4 (d) is the phase response that 35GHz of modulation drives signal.Change between-90 degree and 90 degree when controlling the analyzer angle, can realize that relative phase changes between-180 degree and 180 degree.Experimental result and analysis result coincide, and further confirm the existence of Polarization Modulation, have also verified that this optical SSB Polarization Modulation can be used for realizing micro-wave light quantum phase shifter, and then have played an important role in microwave photon signal process field.If use the 90 degree microwave bridges in broadband, can realize the frequency sweep phase shift of broadband range.
In order to verify that transmission has the resisting chromatic dispersion performance to the optical SSB Polarization Modulation method that the present invention proposes for long term distance, below will be investigated transmission performance of the present invention.Fig. 5 (a) and Fig. 5 (b) are respectively spectrogram and the planisphere that the direct input spectrum instrument of 10GHz50M baud 16 quadrature amplitude modulation (QAM) signal that microwave source produces obtains; Fig. 5 (c) and Fig. 5 (d) are respectively the modulation of optical SSB polarization modulation signals spectrogram and the planisphere that above this 50M baud 16QAM signal records after the 25km Optical Fiber Transmission that apparatus of the present invention produce.As can be seen from the figure, before and after transmission, two planispheres do not have obvious difference, after this explanation transmission, the signal of signal before transmission, significantly do not worsen.From the data that record, the corresponding error vector magnitude of the planisphere recorded before transmission (EVM) is 3.17%, and the corresponding EVM of planisphere recorded after the 25km transmission is 3.51%, relatively before transmission, only worsened 0.34%, the optical SSB Polarization Modulation long term distance transmission performance that these explanation apparatus of the present invention realize is good.

Claims (7)

1. an optical SSB Polarization Modulation method, it is characterized in that, the microwave signal of microwave source output is divided into to the microwave signal of two-way quadrature, and the mode of utilizing Polarization Modulation wherein a road microwave signal be modulated on the linearly polarized light carrier wave, generate initial polarization modulation signals; By after 45 ° of the polarization state of initial polarization modulation signals rotations, utilize the mode of Polarization Modulation that an other road microwave signal is modulated on the postrotational initial polarization modulation signals in polarization direction, obtain final optical SSB polarization modulation signals.
2. an optical SSB Polarization Modulation device, is characterized in that, comprises the linear polarization light source, the first light polarization modulator, Polarization Controller, the second light polarization modulator that connect successively along optical path direction, and microwave source, 90 is spent microwave bridges; The output of microwave source is connected with the input of 90 degree microwave bridges, and two outputs of 90 degree microwave bridges are connected with the driving signal input of the first light polarization modulator and the driving signal input of the second light polarization modulator respectively; Output after described Polarization Controller can rotate 45 ° by input polarisation of light state.
3. optical SSB Polarization Modulation device as claimed in claim 2, is characterized in that, described the first light polarization modulator has identical Polarization Modulation coefficient with the second light polarization modulator.
4. optical SSB Polarization Modulation device as claimed in claim 2, is characterized in that, also comprises the identical signal amplitude adjusting device of driving signal amplitude that can make the first light polarization modulator, the second light polarization modulator.
5. optical SSB Polarization Modulation device as claimed in claim 2, is characterized in that, described 90 degree microwave bridges are broadband 90 degree microwave bridges.
6. optical SSB Polarization Modulation device as claimed in claim 2, is characterized in that, described the first light polarization modulator, the second light polarization modulator are the wideband polarization modulator.
7. optical SSB Polarization Modulation device as claimed in claim 2, is characterized in that, described microwave source is the wide-band microwave Sweep Source.
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CN103795472A (en) * 2014-03-04 2014-05-14 上海交通大学 Three-dimensional modulation ultra-wide band signal generation method based on single double-drive modulator
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CN106053938A (en) * 2016-06-18 2016-10-26 西安电子科技大学 Apparatus and method for realizing instantaneous microwave frequency measurement by dual polarization modulators
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CN103795472B (en) * 2014-03-04 2016-01-13 上海交通大学 Based on the production method of the three-dimensional modulating UWB signal of single Dual Drive modulator
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CN108267636A (en) * 2018-01-10 2018-07-10 南京航空航天大学 Fm microwave signal parameter measuring method and device based on photon technology

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